What Is Indicated by the Fact That NOT All Eukaryotic

question 36

Multiple Choice

What is indicated by the fact that NOT all eukaryotic cells contain both mitochondria and chloroplasts?

• A) Endosymbiosis did not occur at all.
• B) Endosymbiosis occurred only in the evolution of mitochondria.
• C) Endosymbiosis did not occur in stages.
• D) Endosymbiosis occurred in stages.

---

Definitions:

Neurons

Specialized cells in the nervous system that transmit information to other nerve cells, muscle, or gland cells through electrical and chemical signals.

Glial Cells

Non-neuronal cells in the central nervous system and the peripheral nervous system that do not produce electrical impulses but are essential for the support, protection, and nutrition of neurons.

Nerve Cells

Specialized cells that transmit electrical and chemical signals throughout the nervous system, enabling communication between the brain and the body.

Adult Brain

The matured human brain, fully developed and characterized by complex cognitive, emotional, and social capabilities.